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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bb2145f36809c504b07ae50e1ba4751d0d6cedb2b1f4abdfe782d5d48746ef98' 
  AND token = 'J8ae9BsE2p22mXuA15RSXPmdjHoPlgIZFVA13g75TFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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