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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3947b85a5c48935cfb44a479a5890cf36f7bb32dffdb85ae5bc93cc4bd1bc285' 
  AND token = 'zmUuP/5/lWdL727/J+ZD+E5xC9TJmcqYaRSV7Mf7lKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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