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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9fa9ef285e61ecf92b94f7561502a63f33f543a10acf748b3ca1ee66d2422a69' 
  AND token = '4f8EcZWhQkw5PN1vgOgHintRQK5ByXEXR9H9adPpqo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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