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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '70f571e05e2e779e1d8567b80cf78cc6397018ff5878df6ce1d0ef817c8e4288' 
  AND token = 'RyrOb1JvUlOarEy0w6s6uxNE+aGXYWi1lJl6wFMtfK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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