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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cb479e3c0c0714b734b33ced37ecb530255a2019fb7473d038f79c217fbe2e84' 
  AND token = 'hz3/0SH3fKtgpau0/w0iN0CP6vyotdNVWdrJKa0BMLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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