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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '746bd8fc80a3377e03297fe77ca10a79d6395caf86e308b485d358b129ddf62c' 
  AND token = 'OTYkAyY73TzFaCX/lta4k3unlHRCXj5gyGpUcM795ag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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