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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd5c30c71c7915f2f94311b175e77031a9c16b0fa78878d23075e978eacfc524c' 
  AND token = '+8iwHuO0ZUbY5Ryhx2G9A7U7XR48cju4XJIm79e+IiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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