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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c0c25c1161cb52ead8c53473eb11efbf557adf25f3d8baa528ecb96f501b7384' 
  AND token = 'FkyeT7YWsZVv3EfXtDncQP4kcp6ahQQVKA3CMcINCsk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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