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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '83e80b55eb63b8b739ea78f2a97cf34b607ae64da8d533995b30ba919583e970' 
  AND token = '2Y4rBDucXP6YuCdrtYkdSl0y2mmeBTU+rBGsimTD0DQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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