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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '14c0293cbd43af0708a54386f5db92b0d9ab0f58d69f85987ab6167f163acfaa' 
  AND token = 'bfSYCTxUYmxswfH04uzOut16kZzjsQcwJcE3dnGTxA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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