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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1d567f062a7b3fc989f1a0b7fc39142abdf5f4d590d65d12ff2c548df4719469' 
  AND token = '8PrLrpyvaefnBLdGCh2pJY728FbTpCgH4Zckhl0Zdn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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