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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f8dc962b3a92b3ec545b5fee2b4fff3c858889e323a679cd98963da82640d9fe' 
  AND token = 'Gk36aIZJDNeYr695bN3Bh5bLi6xBjImip8109A2iKUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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