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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2050f35fc8fea080afe79d701ef781a633efe5716afdd38396fc58e010342125' 
  AND token = '5HustgN8do9BYBY7gVBdu12k/FKV6KJFyiLzKX8IBRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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