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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '11ee3e643e0ae481664a0b2e71d19495fe10ac2b3ff74615281f3a49c57f0527' 
  AND token = '219cnboEpop/0UNJC1clLz65NYWNFaLx2daYhyX3LHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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