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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a68876dc1a7239c302d0b8ec33384175172e983bffe40ca6a6374bb46fb4dc94' 
  AND token = 's/SWM4pA9509omyK/rknfbqc74YzHoN9zbyTswBoMxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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