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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e3322724d1313a7583d668afd291d511c16e623c8fd130f91517631f511ba92d' 
  AND token = '1bXpQK+e3Z1neUYgFFeHwxhC7TPKFOv+Aj0xb1nn2MY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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