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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fa6b5f8c7301dd2c043cc886ac926136f6603f7de233630e8be74563fdefd441' 
  AND token = 'v0MXHa0CGsVBrM4s6s0DaHAiIKSmicvbFuizd1bNT5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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