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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '261d31ef7e801b6f838f24620db2f0cedcee88c34946984ac2d0d2a9749acb89' 
  AND token = 'jeLNwgrYMbJPYpuKDuFtkPGwi2Tkm/0sk8xmnA+ga+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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