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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1557e45017c91bc19852690acc3b257a1d06eafa7b38ed38c52bad435fe0326c' 
  AND token = 'WnjAHqGM7xi8ElEdlqpSmR/HSbW3HyeWHoi7wYSXd7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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