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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '626c2610e4b78dd2860bb3f2959e99f761553dc8366e629e6aa84bf25575e592' 
  AND token = 'UVGH71ZynGAqxMZY91Ep8RdZ/v09p/E9Yn3bwT1S4YM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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