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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4eab65132ec833c60f9c88de51e95cd5ee90d5656f0319b3d2bba249321c25ca' 
  AND token = 'T6Ydd2ryNwNaJBgP/xBDZMnuV3hmdm3pIli4t2y4ego=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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