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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ab9f48d6bdd53a7d52fda1eb9ad8839f910d2c67f60cfb1191eb327bf4e29256' 
  AND token = 'q8W4J6No4uMUADWVaQI6Cas48fOY37edOCzb/O0Rpgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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