SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e7403c40fa448f870916be68034dc522eeb2557d8ad7595e50cac1d0be5ddbb0' 
  AND token = '+z1mr6d/zMLvBbLKKYCqC2Bb/o/aI/Nt0lwH37GjxNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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