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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '02a2b7fee246d1dd02a7f9fb80aacb48bcac12dcb773b28896c02e05f9bca1bb' 
  AND token = 'yoKMkwTP7avnvNfuVyPpL3a2pTCWTV5F7+Rl5vYpTy8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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