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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '41cb34bc4874808429c2b18dbd1c33f5c97244de7b7ecdd5bc5814df3402175f' 
  AND token = 'eX5+iQam5ueH340uVZau0n1Wofy+3mSu6YqNBxJNaQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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