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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '65c112d198d176c5963b3b6bdb0b2a5c2e330da2c675e07cef7920163a492687' 
  AND token = 'xbVmTk2RTbhe8BNGQb+QfSBNfXqH9Dpm4MfAM4ow27c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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