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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e68adc197d5fa2d2a33c3b89a60e8ce7ed419e7ff197dd46a858ca1e7698d1e0' 
  AND token = 'RV6dZS9gh84y7+lKEY1Y4+A/F4j87U/6MzgbFn+WdPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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