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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b8b7c1e0b0084bab7a2a2843ce141a09afc84463ab5f2427cdc74802cfa14c06' 
  AND token = 'Y5yTulwkAw+MshZF4y+5lnx7o1yzGjOrtgsJr3RRIp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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