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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c4ee43062c23fca8787a4687e8b82b9ee5297a51817a9336c30f38410a3119ec' 
  AND token = 'qEpX375+MewtdJh8NS7P2BFdaVeOKm+6KKkNvzSpEWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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