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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0c4b858eb55251faed66003070a842697dc7cf9771da3d153a2607737689dcb9' 
  AND token = '/TjUatlzqih46A59c5YEC5bTkzEV+/OmTBcvCt0+jis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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