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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f9ed1fb42ab6944c60de9c5bb6510d0758e46ab272feac20a6b5e341a670d37c' 
  AND token = 'pey2VjNEP7CWckBp4s0Xhxysp01AqvdT48tx7OzHqnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}