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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ad079c729007512ce9a0353f76f11aabe41839d998939376b0653b9033df7913' 
  AND token = 'QsksxUsTv5w+T5DyWF+Pzmyz9TpNY9mdmbev/VxEowM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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