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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd08ca59a15cdf9dfca6da8a8b7bf727dc0be41ee06c52dffcd5d8de8cb11390e' 
  AND token = '97ajJeVEHJXLhrSVWQ/OydErxPjtttEOiLcbwRse8jQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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