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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a11ba3b96c760068e9c3f0c46b71b0f1db0d1ba968ca743e91d9eae13a232f82' 
  AND token = 'bciY4inw3NRRwm2+gH3EFvCw3eYZrFesXsUHFEBlW9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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