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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '22e618287d85c0ea76f934f11dd819ba59c7766a6c94c41113a10a5829cc486a' 
  AND token = '85syzcfKdSdlqqZxlFMV8CE3Avp2p1BCC2M5EoPurBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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