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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ff0ffaeabcbcd0f9c4c9b8e343bdd7272357d5de9ad8c9cda8dbe5e26395011c' 
  AND token = 'qYAyxt6opg/YKHd2NWZqCA4LKbfMpNqUm7fPdGfDP/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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