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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '83c33caea4c81a4641b607325bbab9445e168daf59544476d30f7605ef820ba9' 
  AND token = 'GM8Ai6n4tI1dNh7Gfac5Hf2joGtWX/kFtvpMSZKhiLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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