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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3a06c7f86ac7bdc6c9fad99979362bd8d39d326e43981f9a117c04961b2cba0e' 
  AND token = 'QFmYz9mMf4DbehrIwIgjh3mSd9TB7qmaSRvveHtU7wU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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