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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd2d7a93a11b83358fd46a0d4935e0eade5b248eb2e52a08522cbfc823c7d73ad' 
  AND token = 'pAOnvzKXncBZsJH62dSHG9oFCy0MBP3ftsMRArym1tc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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