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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7f1ab9c49fd3173c39d2a40b07c056662a271447925658a17c698ac3c59e4667' 
  AND token = 'SybKNSj6VA9VV4te1tIDZdLNAcV/vZvVQPO1o5HgUic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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