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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '30e90d4260ba099489eb25721d85e69cd435e872add6624f2c66c3242cdcbbb1' 
  AND token = 'uz5JbsG17ZlvWgl426odoSiok1BIGcIxuVdnrf8k6EI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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