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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0299cb77c2c2cd83b3ea0d31e0bc366a7792807d5dd20b3e252b45d5ec8fbd7a' 
  AND token = 'MCYWbAfjgy7FPV7IGPTWcZKKn6G8DpK7TfsXAbOLLG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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