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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '16b655827b4439f64eccd8031a1451611bcc182cb830794a2ce8b07ed2d8ce68' 
  AND token = 'z0zztjtiSGaa4mhbo3Ga/igu4aVi5k17CEHuM22je54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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