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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a3f3823cf1e4cfd64d51459cde9d338ce681f061d23d5fd60d419554e2ee45c2' 
  AND token = 'Yu8AVuzbJua4VtixKW6Nhx0r6Qdsc7aF3h6EslSvuXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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