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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '135d83dabdc9db88a4d19f5b909e06f504d8cf153f37f5ddb41da5660bb4433f' 
  AND token = 'uZILM97NPLhOEA4cpGJl/pmH+feEgxx62ot9vUE+xSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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