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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e0f6858b529c38ed8c16b9c2451655bde415fccff4f140c3f2c9a3cbd1ebe044' 
  AND token = 'Q/r/zgb5tknbMm5OKAHDuzgMWzOxQnxcaSQLPPDVCH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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