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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '79a87c375479276ec082ed5c1a0538a4d4168f234428e0356867f32dbd4a92fc' 
  AND token = '3nza1G4zjavkXvGla87LE250SLHUl1X4mkg1Xldsmdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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