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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2124db9a991da239b4235febf009a15b7d7113bb59a9ede31179ddc134d3afd2' 
  AND token = 'ksPkNP/6l4f/9lGl58N0a323/S/dtfSNQpFF3J88zEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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