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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '77aa83a32fdad7431ab55426ea47fd36bf6d8fa14611c5282becbb17c3bcb5f7' 
  AND token = '3PZaSpQaQohwm72vJS0wQjNwNe2ScH/euzTp6+i6nuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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