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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3da95d2efe767985940917f7e8c5feb56280d5bdd968fed900834fbc59027bea' 
  AND token = 'S6HBhzRYS+fL67f+yeQanPRAbJ5zzF7LUTltJpnNN4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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