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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd55daafd058da9d988b2dd802c2d3c3f494818d40015a1ccf6690f72600203bd' 
  AND token = 'z0aKgE9nRSWnRfIFfKJHPWGUZPEg5y6S0S3892cIIK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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