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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '17f4f8933530a4891f69b002b64152f0f7f21dfd04d6bc649b03b7f57bad3b12' 
  AND token = 'kP2ojunl2F8EXXaMc/TXpoqx4M0nBRnaA0dTauKGnZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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