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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '37ede23dbb5642141d4e6d8d34bfd26f03a65c88d6f0d3506faa36967c5c38cf' 
  AND token = 'DA3UHLoOrAKJLX1QkXX3fH1+792ZfsBBIZDMLew4X6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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