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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '08238123571353199022f616fcb7e5fca4d33b753da850b4f91e5f30ba96b655' 
  AND token = 's0Mc9fO+dqzWJedck5b0XWFOGdb2MR9lSiKbAne0gOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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